d3.js - Scatterplot is not updating the number of circles -


so here code, in gist, can save html file , try it:

https://gist.github.com/babakinks/5407967

so @ beginning assuming default number scatter plot circles, , draw scatter plot

var numdatapoints = 50;

then @ bottom, have listener redraws scatter plot random new values, , works..but wanted improve such can type how many circles draw in text box , should draw many circles, not same 50 began with. doesn't listen me! yes redraw circles new random values still drawing same number of circles had @ first . don't know how fix part, pretty new d3.js . way expecting work wrong? 

    //on click, update new data                 d3.select("#drawbtn")         .on("click", function() {

you need add enter() , remove() selections:

<!doctype html> <html lang="en">   <head>         <meta charset="utf-8">         <title>yguyghggjkgh</title>         <script src="http://d3js.org/d3.v3.min.js"></script>         <style type="text/css">              .axis path,             .axis line {                 fill: none;                 stroke: black;                 shape-rendering: crispedges;             }              .axis text {                 font-family: sans-serif;                 font-size: 11px;             }          </style>     </head>     <body>          <div>           <input type="text" id="count" name="howmany">           <input type="button" id="drawbtn" value="draw">         </div>           <script type="text/javascript">              //width , height             var w = 500;             var h = 300;             var padding = 30;              //dynamic, random dataset             var dataset = [];                                           //initialize empty array             var numdatapoints = 50;             console.log("so here.")                                                   var maxrange = math.random() * 1000;                        //max range of new values             (var = 0; < numdatapoints; i++) {                   //loop numdatapoints times                 var newnumber1 = math.floor(math.random() * maxrange);  //new random integer                 var newnumber2 = math.floor(math.random() * maxrange);  //new random integer                 dataset.push([newnumber1, newnumber2]);                 //add new number array             }              //create scale functions             var xscale = d3.scale.linear()                                  .domain([0, d3.max(dataset, function(d) { return d[0]; })])                                  .range([padding, w - padding * 2]);              var yscale = d3.scale.linear()                                  .domain([0, d3.max(dataset, function(d) { return d[1]; })])                                  .range([h - padding, padding]);              //define x axis             var xaxis = d3.svg.axis()                               .scale(xscale)                               .orient("bottom")                               .ticks(5);              //define y axis             var yaxis = d3.svg.axis()                               .scale(yscale)                               .orient("left")                               .ticks(5);              //create svg element             var svg = d3.select("body")                         .append("svg")                         .attr("width", w)                         .attr("height", h);              //create circles             svg.selectall("circle")                .data(dataset)                .enter()                .append("circle")                .attr("cx", function(d) {                     return xscale(d[0]);                })                .attr("cy", function(d) {                     return yscale(d[1]);                })                .attr("r", 2);              //create x axis             svg.append("g")                 .attr("class", "axis")                 .attr("transform", "translate(0," + (h - padding) + ")")                 .call(xaxis);              //create y axis             svg.append("g")                 .attr("class", "axis")                 .attr("transform", "translate(" + padding + ",0)")                 .call(yaxis);               //on click, update new data                         d3.select("#drawbtn")                 .on("click", function() {                     //new values dataset                     var numvalues = parseint(document.getelementbyid('count').value, 10);                     console.log(numvalues);                     var maxrange = math.random() * 1000;                                             dataset = [];                                               //initialize empty array                     (var = 0; < numvalues; i++) {                       //loop numvalues times                         var newnumber1 = math.floor(math.random() * maxrange);  //new random integer                         var newnumber2 = math.floor(math.random() * maxrange);  //new random integer                         dataset.push([newnumber1, newnumber2]);                 //add new number array                     }                      //update scale domains                     xscale.domain([0, d3.max(dataset, function(d) { return d[0]; })]);                     yscale.domain([0, d3.max(dataset, function(d) { return d[1]; })]);                      //update circles                     svg.selectall("circle")                        .data(dataset)                        .transition()                        .duration(1000)                        .attr("cx", function(d) {                             return xscale(d[0]);                        })                        .attr("cy", function(d) {                             return yscale(d[1]);                        });                      //enter new circles                     svg.selectall("circle")                        .data(dataset)              .enter()              .append("circle")                        .attr("cx", function(d) {                             return xscale(d[0]);                        })                        .attr("cy", function(d) {                             return yscale(d[1]);                        })              .attr("r", 2);                      // remove old                     svg.selectall("circle")                        .data(dataset)              .exit()              .remove()                  });           </script>     </body> </html>

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